Topic: [ANN] US/North American Bitfury sales NEW STOCK ***NOW SHIPPING*** - page 230. (Read 576936 times)

Quote from: A Meteorite on July 16, 2013, 09:06:25 PM

For 0.65V you need exactly 1K resistor for R01F.
For 0.70V you need 1.5K.

With 1K resistor I get 1.26Amps @ 12.0 V, so 15Watts for an h-board.

[edit] Remember, with 16 chips, soldering that higher value resistor will quickly max out the amps that the regulator can handle.

Perfect. Thanks Dave!

My heatsinks are ready

You should post a how to and the results of your mod after you've done it. I know I'll be interested.

Its been done a few times with the single-chip test adapter. Someone got over 3Gh/s out of it. Not sure where that thread is now, but it involved a heatsink (on *top* of the chip) and a pretty aggro fan. I think we will start to see hotter M-board compatibles in the near future.

That is pretty great that just replacing the backplane allows for some overclocking potential.

buzzdave

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Quote from: jimrome on July 16, 2013, 08:59:39 PM

Quote from: jimrome on July 16, 2013, 08:59:39 PM

For 0.65V you need exactly 1K resistor for R01F.
For 0.70V you need 1.5K.

With 1K resistor I get 1.26Amps @ 12.0 V, so 15Watts for an h-board.

[edit] Remember, with 16 chips, soldering that higher value resistor will quickly max out the amps that the regulator can handle.

Perfect. Thanks Dave!

My heatsinks are ready

You should post a how to and the results of your mod after you've done it. I know I'll be interested.

Its been done a few times with the single-chip test adapter. Someone got over 3Gh/s out of it. Not sure where that thread is now, but it involved a heatsink (on *top* of the chip) and a pretty aggro fan. I think we will start to see hotter M-board compatibles in the near future.

A Meteorite

full member

Activity: 120

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For 0.65V you need exactly 1K resistor for R01F.
For 0.70V you need 1.5K.

With 1K resistor I get 1.26Amps @ 12.0 V, so 15Watts for an h-board.

[edit] Remember, with 16 chips, soldering that higher value resistor will quickly max out the amps that the regulator can handle.

Perfect. Thanks Dave!

My heatsinks are ready

You should post a how to and the results of your mod after you've done it. I know I'll be interested.

jimrome

sr. member

Activity: 434

Merit: 250

Quote from: nightengale on July 16, 2013, 08:46:44 PM

For 0.65V you need exactly 1K resistor for R01F.
For 0.70V you need 1.5K.

With 1K resistor I get 1.26Amps @ 12.0 V, so 15Watts for an h-board.

[edit] Remember, with 16 chips, soldering that higher value resistor will quickly max out the amps that the regulator can handle.

Perfect. Thanks Dave!

My heatsinks are ready

jimrome

sr. member

Activity: 434

Merit: 250

When did the August delivery 25 Gh/s kit sell out?

Within 24hrs of the OP.

nightengale

hero member

Activity: 574

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When did the August delivery 25 Gh/s kit sell out?

buzzdave

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Activity: 472

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Quote from: jimrome on July 16, 2013, 04:43:41 PM

Quote from: buzzdave on July 16, 2013, 04:17:02 PM

Quote from: jimrome on July 16, 2013, 03:01:35 PM

Quote from: sunniestsolomin on July 16, 2013, 02:06:21 PM

Is there a datasheet available for these chips? I'm looking to start a board design that will push them a bit harder than the c-scape board.

Not so much a formal datasheet just yet. I can provide pinouts and files for the test adapter that will give you instructions enough to get it going and overclock the chip. There are also resources that are blogging/posting about their work:

https://bitcointalksearch.org/topic/ann-bitfury-is-looking-for-alpha-testers-of-first-chips-free-money-here-228677
https://bitcentury.io/blog/initial-testing-of-bitfury-asic

Hi Dave,
If you could provide the schematic section for the H-board power supply it would be very useful for those looking into overclocking.

H-board regulator is this part Texas Instruments TPS53355. You can use it to OC the chips, but on the H-board 16 chips will max this thing out at .8v or so.

Thanks Dave. Is the standard reference design used as per the datasheet? I guess what I'd like to determine is which resistor to adjust, and the math which determines the output voltage (based on the formulas in the datasheet).

For 0.65V you need exactly 1K resistor for R01F.
For 0.70V you need 1.5K.

With 1K resistor I get 1.26Amps @ 12.0 V, so 15Watts for an h-board.

[edit] Remember, with 16 chips, soldering that higher value resistor will quickly max out the amps that the regulator can handle.

buzzdave

vip

Activity: 472

Merit: 250

Quote from: Foofighter on July 16, 2013, 12:27:23 PM

Quote from: sunniestsolomin on July 16, 2013, 12:09:48 PM

Can anyone (Or Dave) figure out the distance between mounted H-Boards?

I'm trying to figure out the standoff size.

can give you the measurements you needs, currently designing a housing for it so if have got them.

hboard distance is 20mm

Hmmm...

I'm not sure how you calculated this, but my rough estimation is around the same number. Here is how I am guessing, please tell me if I made a mistake as my method is kinda rough.

I looked at the schematic earlier in the thread. Took 164mm, counted 8 slots (from the right side of the board), figured the distance between each slot looked to be about the same dimensions as the slots themselves and calculated (164/16 = 10.25). Then consider the measurement we want is the distance from middle of the slot to the next middle of the slot (minus the thickness the PCB) = 20.5 mm

So, are the PCBs .5mm thick?

If we're right and it is 20mm, that's great. However, if it's 19.75 or 20.25, after stacking 16 of these there will be problems.

slots are 20mm on center like FooFighter said. Board thickness is .062 - subject to change -

buzzdave

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Quote from: cet on July 16, 2013, 12:02:28 PM

Im pretty sure dave refunded the difference between the old and new october prices. I'm not sure if anyone had ordered the h-boards before he raised those prices but I suspect that the count was small enough that Dave has grandfathered them.

/cet

I reduced prices back down after only two order had hit. In one case he got an extra H-board, in the other, he got refunded the difference.

jspielberg

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Activity: 490

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Quote from: buzzdave on July 16, 2013, 04:15:13 PM

Quote from: jspielberg on July 16, 2013, 02:51:00 PM

Has it been clearly stated if purchased in BTC ... if refunded... would be refunded in USD? I assume so, but I didn't see it stated (actually I am lazy and didn't look because I am lazy Grin

)

Please check OP for refund policy thanks

Thanks Dave... Glossed right over it with a second reading even. Found it though... And as expected, USD denominated refund for BTC purchases. Works for me.

Can't wait for btc to rise so I can order a miner from you!

jimrome

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Activity: 434

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Quote from: buzzdave on July 16, 2013, 04:17:02 PM

Quote from: jimrome on July 16, 2013, 03:01:35 PM

Quote from: ||bit on July 16, 2013, 03:30:28 PM

Is there a datasheet available for these chips? I'm looking to start a board design that will push them a bit harder than the c-scape board.

Not so much a formal datasheet just yet. I can provide pinouts and files for the test adapter that will give you instructions enough to get it going and overclock the chip. There are also resources that are blogging/posting about their work:

https://bitcointalksearch.org/topic/ann-bitfury-is-looking-for-alpha-testers-of-first-chips-free-money-here-228677
https://bitcentury.io/blog/initial-testing-of-bitfury-asic

Hi Dave,
If you could provide the schematic section for the H-board power supply it would be very useful for those looking into overclocking.

H-board regulator is this part Texas Instruments TPS53355. You can use it to OC the chips, but on the H-board 16 chips will max this thing out at .8v or so.

Thanks Dave. Is the standard reference design used as per the datasheet? I guess what I'd like to determine is which resistor to adjust, and the math which determines the output voltage (based on the formulas in the datasheet).

cet

member

Activity: 100

Merit: 10

I'm enjoying the idea that this all should force BFL's hand to make price changes. Even BFL's vouchers will be of little use with the intro of this product for it's price. If you guys can truly hit that efficiency target, then pressure will really be on them. Trying to think in a business perspective, I am curious how they will respond. We already saw them react to Avalon.

I think BFL has burned lots of bridges and continue to burn them. I know I'll avoid them no matter the deal they offer. Slow product delivery and poor customer service makes for a doomed company even if they were once the market leader.

/cet

Flying Hellfish

legendary

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Verified Bernie Bro - Feel The Bern!

Quote from: buzzdave on July 15, 2013, 03:12:32 AM

Quote from: mik3 on July 14, 2013, 10:05:26 PM

So buzzdave, just to double check, refunds are possible before units ship right?

Yes refunds are available. If we plan to change the 100% refund policy we would give everyone time to consider before dropping a bomb on you.

Wonderful, it is reassuring to know that if you decide to break FTC regulations you will let everyone know before doing so.

Your response left me feeling a little uneasy.

tacotime

legendary

Activity: 1484

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Quote from: buzzdave on July 16, 2013, 04:17:02 PM

H-board regulator is this part Texas Instruments TPS53355. You can use it to OC the chips, but on the H-board 16 chips will max this thing out at .8v or so.

Does that mean we can expect about 38 GH/s per H-board @ ~30W overclocking with the stock hardware, given adequate cooling?

buzzdave

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Quote from: ||bit on July 16, 2013, 03:30:28 PM

I'm enjoying the idea that this all should force BFL's hand to make price changes. Even BFL's vouchers will be of little use with the intro of this product for it's price. If you guys can truly hit that efficiency target, then pressure will really be on them. Trying to think in a business perspective, I am curious how they will respond. We already saw them react to Avalon.

Dave, is Tom involved in any of this?

No not in any way. The chip design is Bitfury, who teamed up with Tytus to fund the NRE.

buzzdave

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Quote from: jimrome on July 16, 2013, 03:01:35 PM

Quote from: jspielberg on July 16, 2013, 02:51:00 PM

Is there a datasheet available for these chips? I'm looking to start a board design that will push them a bit harder than the c-scape board.

Not so much a formal datasheet just yet. I can provide pinouts and files for the test adapter that will give you instructions enough to get it going and overclock the chip. There are also resources that are blogging/posting about their work:

https://bitcointalksearch.org/topic/ann-bitfury-is-looking-for-alpha-testers-of-first-chips-free-money-here-228677
https://bitcentury.io/blog/initial-testing-of-bitfury-asic

Hi Dave,
If you could provide the schematic section for the H-board power supply it would be very useful for those looking into overclocking.

H-board regulator is this part Texas Instruments TPS53355. You can use it to OC the chips, but on the H-board 16 chips will max this thing out at .8v or so.

buzzdave

vip

Activity: 472

Merit: 250

Has it been clearly stated if purchased in BTC ... if refunded... would be refunded in USD? I assume so, but I didn't see it stated (actually I am lazy and didn't look because I am lazy Grin

)

Please check OP for refund policy thanks

||bit

hero member

Activity: 924

Merit: 506

I'm enjoying the idea that this all should force BFL's hand to make price changes. Even BFL's vouchers will be of little use with the intro of this product for it's price. If you guys can truly hit that efficiency target, then pressure will really be on them. Trying to think in a business perspective, I am curious how they will respond. We already saw them react to Avalon.

Dave, is Tom involved in any of this?

jimrome

sr. member

Activity: 434

Merit: 250